Modifying The General Configuration Items; To Select The Emulator's Clock Source - HP 64751 User Manual

Modifying the General Configuration Items

In order to modify the general configuration items, you must first start the
configuration interface and access the "General Items" configuration section (refer
to the previous "Using the Configuration Interface" section).
This section shows you how to:
•
Select the emulator's clock source.
•
Enable/disable entry into the monitor after configuration.
•
Restrict to real-time runs.
•
Turn OFF the restriction to real-time runs.

To select the emulator's clock source

For 64751-66508 and higher numbered active probe printed-circuit boards, the
selection of the internal or external clock source is made by positioning a jumper
module on the board as described in the "Plugging into a Target System" chapter.
For 64751-66506 and lower numbered active probe printed-circuit boards, the
selection of the internal or external clock source is made with the "Micro-processor
clock source?" configuration question.
• Answer "internal" or "external" to the "Micro-processor clock source?" question.
When you answer "internal", the emulator will use the internal 32.768 KHz crystal.
The target system MUST drive MODCLK high (or allow a pullup resistor in the
emulator to pull it high) during reset to enable the 68340 voltage-controlled
oscillator (VCO).
When you answer "external", the emulator will use the crystal or TTL oscillator in
the target system. MODCLK should be driven appropriately.
Generally, you should select the external clock option when using the emulator
in-circuit to synchronize the emulator with your target system.
Chapter 5: Configuring the Emulator
Modifying the General Configuration Items
119